Well, all that pre does look inviting...

Katie swallowed hard, her eyes glued to Sarah's throbbing prick, pointing almost directly at her, bobbing up and down with the girl's heartbeat. The clerk glanced around quickly and stepped into the booth, fully clothed except for her open fly, pussy still dripping from her voyeuristic endeavors. With Adam still recuperating from his convulsive orgasm on the floor, it got a little crowded, but that didn't deter Sarah. She gently shoved Katie back against the wooden wall of the booth, pulled down the clerk's pants a bit and then rubbed her glans over the sodden cunt before her.

Katie shuddered in anticipation and whispered: "Oh god, this is going to split me open.."

"Sure will - watch!," Sarah replied and let her cock slide into the well-lubricated hole between the clerks legs. Katie gasped and her eyes went as wide as saucers, her head tilting back against the wood. Staring at the ceiling, she tried to deal with the feeling of being stretched to her limit. Sarah did not give her much time - she had been close to cumming inside Adam before and wanted to plant her seed into a waiting womb.

Subsequently, she didn't bother much with technique, instead plowing away determinedly. Katie obviously didn't mind much, if her moans and squeals were anything to go by. Not that Sarah fared better, the tight cunt squeezing her rod exquisitely caused her own voice to rise in volume.

"Oh! God! So big... biggest one... I ever had..." she managed to get out between excited gasps and lewd moans. The compliments to her dick size made even more blood flow into Sarah's member, although they did feel a bit strange since she had had it for all of 12 hours at this point. Katie gasped as she was stretched even more, Sarah's glans expanding and rubbing against her inner walls even tighter. Sarah reciprocated the attention by cupping and squeezing Katies C-cup tits through her bra with one hand, the other using Katies bubble butt to steady her rythm.

Adam, meanwhile, had come down from his afterglow and was shocked to see Sarah fucking someone else besides him. That cock was his! He was the only one that deserved its creamy white goodness! He tried to stand up, but his legs were still too weak from the amazing orgasm earlier. Sarah noticed his struggling and turned her head to him.

"Don't worry Ada, I won't give her all of it," she moaned out between her thrusts. Katie was too far gone to catch the sentence, but when Sarah turned back to her, she pulled her into a deep french kiss, letting her tongue dance through the other girl's mouth. The sudden invasion surprised Sarah, and the tingling feeling of her lips against Katie's triggered her orgasm. The first forceful jet hit Katie's insides and the feeling of hot cum in her cunt made her lust boil over. Her lustful moans hit a crescendo and her twitching cunt threatened to squeeze Sarah dry. She only managed to pull her squirting cock out after the second shot and quickly aimed her prick towards the face of her brother. His eyes lit up and he opened his mouth, sticking out his tongue expectantly. Sarah's third shot hit him square across the face, the fourth landed on his chest and the fifth only managed to hit his stomach.

Moaning and slurping, he gathered up as much as he could from his face and chest to gulp it down messily. Smiling contentedly, he looked up at his sister full of love. She was so good to him!

Sarah herself turned back to Katie, checking on her.